This is a Om Mandala Crystal Grid made out of Birch wood. These are made to order, you can choose between approximately 4, 6, 8, 10 and 12" in diameter and 1/4" thick. This is just for the grid, stones much be purchased separately. Crystal grid and healing sets are groups of stones that go together for a purpose. Sets of crystals and stones are used for ritual magickal or spiritual crystal healing purposes or with Reiki-Seichim energy work for healing.